Elemental Conduit

Spellcasting or Pact magic feature.

Your study in the Elemantal planes enabled you to channel a part of their energy like the Elementals themselves.
Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 20.   Learn Aganazzar's Scorcher or Rime's Binding Ice.
Using this feat, you can cast the spell once at its lowest level, and you must finish a long rest before you can cast it in this way again.
When you cast the spell using this feat, choose one way you empower it: The spell ignores resistances to fire/cold (according to the chosen spell) or the targets make their saving throw with disadvantage.   You can also cast these spells using spell slots you have of the appropriate level. The spells' spellcasting ability is the ability increased by this feat.